packagejava.lang.management;importjavax.management.openmbean.CompositeData;importsun.management.MemoryUsageCompositeData;/*** A <tt>MemoryUsage</tt> object represents a snapshot of memory usage. * Instances of the <tt>MemoryUsage</tt> class are usually constructed * by methods that are used to ...
* Constructs a <tt>MemoryUsage</tt> object from a * {@link CompositeData CompositeData}. */ private MemoryUsage(CompositeData cd) { // validate the input composite data MemoryUsageCompositeData.validateCompositeData(cd); this.init = MemoryUsageCompositeData.getInit(cd); this.used = MemoryUsageCom...
This method is used to replace the definition of a class without reference to the existing class file bytes, as one might do when recompiling from source for fix-and-continue debugging. Where the existing class file bytes are to be transformed (for example in bytecode instrumentation) retransfor...
实现“java.lang.OutOfMemoryError: WrappedJavaFileObject”问题的步骤 1. 理解问题 在开始解决这个问题之前,我们首先需要了解“java.lang.OutOfMemoryError: WrappedJavaFileObject”这个错误的含义。这个错误通常表示内存耗尽,也就是程序尝试使用的内存超过了Java虚拟机所能提供的限制。 2. 分析错误原因 接下来,我们...
// limit to get mapped memory. mmap是将虚拟内存区域与磁盘上的对象进行映射,来初始化虚拟内存区域的内容 void*mmap(void*start,size_tlength,intprot,intflags,intfd,off_toffset) 参数含义可以参考:Linux 内存映射函数 mmap()函数详解 虚拟内存区域可以映射到 ...
一、javah命令(C Header and Stub File Generator) 二、jps命令(JavaVirtual Machine Process Status Tool) 三、jstack命令(Java Stack Trace) 四、jstat命令(Java Virtual Machine Statistics Monitoring Tool) 五、jmap命令(Java Memory Map) 六、jinfo命令(Java Configuration Info) 七、jconsole命令(Java Monitoring...
You can modify the following database initialization parameters to tune your memory usage to reflect your application needs more accurately: SHARED_POOL_SIZE Shared pool memory is used by the class loader within the JVM. The class loader, on an average, uses about 8 KB of memory for each loa...
原因是连接池中连接泄漏,可能是使用ossObject后没有关闭。 解决方法 请检查您的程序,确保没有连接泄漏。关闭方法如下: // 读取文件OSSObjectossObject=ossClient.getObject(bucketName, objectName);// OSS操作// 关闭ossObjectossObject.close(); 连接关闭 ...
{"jmxMetrics": [ {"name":"JVM uptime (millis)","objectName":"java.lang:type=Runtime","attribute":"Uptime"}, {"name":"MetaSpace Used","objectName":"java.lang:type=MemoryPool,name=Metaspace","attribute":"Usage.used"} ] } 在前面的配置示例中: ...
<PerformanceCounters> <Jmx> <Add objectName="java.lang:type=ClassLoading" attribute="TotalLoadedClassCount" displayName="Loaded Class Count"/> <Add objectName="java.lang:type=Memory" attribute="HeapMemoryUsage.used" displayName="Heap Memory Usage-used" type="composite"/> </Jmx> </PerformanceCo...